
TY  - JOUR
A1  - Shannon, JS 
T1  - Studies in Mass Spectrometry. VII. Triterpenoids: Ifflaionic Acid
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1963
VL  - 16
IS  - 4
SP  - 683
EP  - 689
KW  - 
UR  - https://doi.org/10.1071/CH9630683 
N2  - The mass spectra of the methyl ester of the new unsaturated pentacyclic triterpenoid ifflaionic acid (urs-12-en-3-on-30-oic acid) and some of its chemical derivatives are presented. These may be used to assign position C-20 to the carbomethoxy and C-3 or C-7 to the keto group. Mechanistic proposals for, and the effect of functional groups on, the main fragmentation of the molecular ions (cleavage through ring C) are discussed. 
ER  -

